Calibration Weighted Fit

{
  "data": {
    "chargedAmount": "100005",
    "inputHash": "sha256:3f640b4b71d0f67ef3300f2fa8c1fdf8239182a5e5da84a158f6f950c…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "weighted-calibration-fit",
    "result": {
      "arithmetic": "exact-rational-fit-and-sse-rounded-12-places; float64-rmse",
      "dataClass": "synthetic",
      "fieldCertified": false,
      "finiteChecked": true,
      "intercept": "1",
      "residuals": [
        {
          "predicted": "1",
          "residual": "0",
          "sampleIndex": 0
        }
      ],
      "slope": "2",
      "weightedRMSE": "0",
      "weightedSSE": "0"
    },
    "resultHash": "sha256:a3d83c1fee397114013c0800e5a9b92c6e28147bbd23ec8fe33fa6700…",
    "sourceContractAmount": "26500",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/compute/calibration/weighted-fit' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","pairs":[{"weight":"1","x":"0","y":"1"},{"weight":"2","x":"1","y":"3"},{"weight":"1","x":"2","y":"5"}]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://www.mahastrategies.com/api/v1/compute/calibration/weighted-fit' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","pairs":[{"weight":"1","x":"0","y":"1"},{"weight":"2","x":"1","y":"3"},{"weight":"1","x":"2","y":"5"}]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.100005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.100005" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.100005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fcalibration%2Fweighted-fit&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/calibration/weighted-fit", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "pairs": [
      {
        "weight": "1",
        "x": "0",
        "y": "1"
      },
      {
        "weight": "2",
        "x": "1",
        "y": "3"
      },
      {
        "weight": "1",
        "x": "2",
        "y": "5"
      }
    ]
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.100005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.100005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/compute/calibration/weighted-fit",
        json={
            "dataClass": "synthetic",
            "pairs": [
                {
                    "weight": "1",
                    "x": "0",
                    "y": "1",
                },
                {
                    "weight": "2",
                    "x": "1",
                    "y": "3",
                },
                {
                    "weight": "1",
                    "x": "2",
                    "y": "5",
                },
            ],
        },
    )
    print(res.status_code, res.text)